Most of the core packages are probably in a subfolder of /usr/local/texlive/2010/
.
I'm not that familiar with mactex, but it's based on TeXlive, so you can use TeXlive utilities to find stuff.
To find where a given package is installed, you can open a terminal and type:
kpsewhich <packagename>.sty
And it should show you the full path to the file.
If you want to install custom classes and style files, I'd recommend using the TEXMFHOME tree. You can find out what this is by typing:
kpsewhich -var-value TEXMFHOME
I believe on a mac this defaults to ~/Library/texmf/. You could for example put a custom class file in ~/Library/texmf/tex/latex/myclass/
. At some point you may need to run:
mktexlsr ~/Library/texmf
to get this folder recognized by the system, but it may already be. (mktexlsr
and sudo mktexlsr
for system files are the equivalent of refreshing the file name database in MiKTeX.)
The command:
kpsepath tex
would show you all the folders searched for tex (.sty and .cls) files at compilation time. (If it ends in /// it'll search subfolders.)
I'm afraid I have no clue why these wouldn't show up in Mac's finder. I don't use a mac.
My best guess is that you are probably behind a proxy that relays all traffic that goes to the internet. Ask your local IT-experts for the proxy's IP-address and port and then goto
Miktex Package Manager -> Repository -> Connection Settings
Set the checkbox at "Use a proxy server" and enter the address and port.
If the proxy-server requires authentication (try with and without), set the other checkbox "Authentication required" as well.
Best Answer
No, but your MacTeX should already have everything TeX Live have to offer from CTAN (the archive). Remember that some stuff on CTAN are not allowed in TeX Live due to licensing issues. (TeX Live have some strict licence rules and DVDs with TeX Live are sold in Germany)
According to CTAN, http://ctan.org/pkg/res, the
res
class has a no-sell license and is thus not allowed in MacTeX. You will have to install it by hand if you want to use it.(updated 2015 with cfrs commet)